To find Brother Lasca, go to The Thieves' Way from any Freeport city zone, or from the sewer entrance in Commonlands for those of good alignment, then to ( 24, 1, 61 ) /waypoint 24, 1, 61 to enter The Serpent Sewer. Next go to ( -243, 1, 11 ) /waypoint -243, 1, 11 to enter Edgewater Drains.